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review.shift-gmbh.com / SHIFTPHONES / kernel / shift / mainline / b24413180f5600bcb3bb70fbed5cf186b60864bd / . / block / blk-mq.h
blob: 4933af9d61f736ed1b99630231b6988071b1e6d2 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +0100[diff] [blame^]1/* SPDX-License-Identifier: GPL-2.0 */
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]2#ifndef INT_BLK_MQ_H
3#define INT_BLK_MQ_H
4
Jens Axboecf43e6b2016-11-07 21:32:37 -0700[diff] [blame]5#include "blk-stat.h"
6
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]7struct blk_mq_tag_set;
8
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]9struct blk_mq_ctx {
10 struct {
11 spinlock_t lock;
12 struct list_head rq_list;
13 } ____cacheline_aligned_in_smp;
14
15 unsigned int cpu;
16 unsigned int index_hw;
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]17
18 /* incremented at dispatch time */
19 unsigned long rq_dispatched[2];
20 unsigned long rq_merged;
21
22 /* incremented at completion time */
23 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
24
25 struct request_queue *queue;
26 struct kobject kobj;
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]27} ____cacheline_aligned_in_smp;
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]28
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]29void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
Tejun Heo780db202014-07-01 10:31:13 -0600[diff] [blame]30void blk_mq_freeze_queue(struct request_queue *q);
Ming Lei3edcc0c2013-12-26 21:31:38 +0800[diff] [blame]31void blk_mq_free_queue(struct request_queue *q);
Jens Axboee3a2b3f2014-05-20 11:49:02 -0600[diff] [blame]32int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
Jens Axboeaed3ea92014-12-22 14:04:42 -0700[diff] [blame]33void blk_mq_wake_waiters(struct request_queue *q);
Omar Sandoval81380ca2017-04-07 08:56:26 -0600[diff] [blame]34bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *);
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]35void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
Jens Axboe50e1dab2017-01-26 14:42:34 -0700[diff] [blame]36bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx);
Jens Axboebd6737f2017-01-27 01:00:47 -0700[diff] [blame]37bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
38 bool wait);
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]39
40/*
41 * Internal helpers for allocating/freeing the request map
42 */
Jens Axboecc71a6f2017-01-11 14:29:56 -0700[diff] [blame]43void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
44 unsigned int hctx_idx);
45void blk_mq_free_rq_map(struct blk_mq_tags *tags);
46struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,
47 unsigned int hctx_idx,
48 unsigned int nr_tags,
49 unsigned int reserved_tags);
50int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
51 unsigned int hctx_idx, unsigned int depth);
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]52
53/*
54 * Internal helpers for request insertion into sw queues
55 */
56void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
57 bool at_head);
Jens Axboe157f3772017-09-11 16:43:57 -0600[diff] [blame]58void blk_mq_request_bypass_insert(struct request *rq);
Jens Axboebd166ef2017-01-17 06:03:22 -0700[diff] [blame]59void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
60 struct list_head *list);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]61
62/*
63 * CPU -> queue mappings
64 */
Jens Axboef14bbe72014-05-27 12:06:53 -0600[diff] [blame]65extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]66
Christoph Hellwig7d7e0f92016-09-14 16:18:54 +0200[diff] [blame]67static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
68 int cpu)
69{
70 return q->queue_hw_ctx[q->mq_map[cpu]];
71}
72
Jens Axboee93ecf62014-05-19 09:17:48 -0600[diff] [blame]73/*
Jens Axboe67aec142014-05-30 08:25:36 -0600[diff] [blame]74 * sysfs helpers
75 */
Ming Lei737f98c2017-02-22 18:13:59 +0800[diff] [blame]76extern void blk_mq_sysfs_init(struct request_queue *q);
Ming Lei7ea5fe32017-02-22 18:14:00 +0800[diff] [blame]77extern void blk_mq_sysfs_deinit(struct request_queue *q);
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700[diff] [blame]78extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
Jens Axboe67aec142014-05-30 08:25:36 -0600[diff] [blame]79extern int blk_mq_sysfs_register(struct request_queue *q);
80extern void blk_mq_sysfs_unregister(struct request_queue *q);
Keith Busch868f2f02015-12-17 17:08:14 -0700[diff] [blame]81extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
Jens Axboe67aec142014-05-30 08:25:36 -0600[diff] [blame]82
Christoph Hellwig90415832014-09-22 10:21:48 -0600[diff] [blame]83extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
84
Ming Leie09aae72015-01-29 20:17:27 +0800[diff] [blame]85void blk_mq_release(struct request_queue *q);
86
Ming Lei1aecfe42014-06-01 00:43:36 +0800[diff] [blame]87static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
88 unsigned int cpu)
89{
90 return per_cpu_ptr(q->queue_ctx, cpu);
91}
92
93/*
94 * This assumes per-cpu software queueing queues. They could be per-node
95 * as well, for instance. For now this is hardcoded as-is. Note that we don't
96 * care about preemption, since we know the ctx's are persistent. This does
97 * mean that we can't rely on ctx always matching the currently running CPU.
98 */
99static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
100{
101 return __blk_mq_get_ctx(q, get_cpu());
102}
103
104static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
105{
106 put_cpu();
107}
108
Ming Leicb96a42c2014-06-01 00:43:37 +0800[diff] [blame]109struct blk_mq_alloc_data {
110 /* input parameter */
111 struct request_queue *q;
Christoph Hellwig6f3b0e82015-11-26 09:13:05 +0100[diff] [blame]112 unsigned int flags;
Omar Sandoval229a92872017-04-14 00:59:59 -0700[diff] [blame]113 unsigned int shallow_depth;
Ming Leicb96a42c2014-06-01 00:43:37 +0800[diff] [blame]114
115 /* input & output parameter */
116 struct blk_mq_ctx *ctx;
117 struct blk_mq_hw_ctx *hctx;
118};
119
Jens Axboe49411152017-01-13 08:09:05 -0700[diff] [blame]120static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
121{
Jens Axboebd166ef2017-01-17 06:03:22 -0700[diff] [blame]122 if (data->flags & BLK_MQ_REQ_INTERNAL)
123 return data->hctx->sched_tags;
124
Jens Axboe49411152017-01-13 08:09:05 -0700[diff] [blame]125 return data->hctx->tags;
126}
127
Bart Van Assche5d1b25c2016-10-28 17:19:15 -0700[diff] [blame]128static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
129{
130 return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
131}
132
Ming Lei19c66e52014-12-03 19:38:04 +0800[diff] [blame]133static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
134{
135 return hctx->nr_ctx && hctx->tags;
136}
137
Jens Axboef299b7c2017-08-08 17:51:45 -0600[diff] [blame]138void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
139 unsigned int inflight[2]);
140
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]141#endif